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GEOMATRIX 6.2 Closure of Tank 127 and Appurtenant Piping ' Tank 127 is an aboveground 150,000 gallon tank constructed of steel. It is planned to continue to use this tank to store fertilizer product. The appurtenant piping, which will be scrapped, ' consists of approximately 500 feet of aboveground welded and flanged stainless steel pipe with an inside diameter of approximately 1.25 inches. To demonstrate tank closure, wipe samples will be collected from the tank sidewalls above the level of fertilizer storage at the time of closure. The locations of the wipe samples will be ' determined by the licensed engineer during closure operations. To accomplish the required sampling, access ways will be cut into the top of the tank in four locations to provide access for wipe sampling. Prior to use, the wipe samples will be treated with a solvent that will remove pesticide residue, if any. The wipe samples will be analyzed for DBCP and EDB using EPA Method 8011, organochlorine pesticides using EPA Method 8080, organophosphorus pesticides ' using EPA Method 8140. Clean closure will be demonstrated by obtaining non-detect results for analysis of all four wipe samples. ' If clean closure of the tank is not achieved, the fertilizer product will be removed from the tank and the tank will be hydroblasted. Upon completion of hydroblasting, four additional wipe samples will be conducted. The locations of the wipe samples will be determined by the licensed engineer during closure operations and will include one floor sample and three sidewall samples. The wipe samples will again be analyzed for DBCP and EDB using EPA Method 8011, organochlorine pesticides using EPA Method 8080, organophosphorus pesticides using EPA Method 8140. Clean closure will be demonstrated by obtaining non-detect results from analysis ' of all four wipe samples. The appurtenant aboveground piping will be scrapped. Since the piping was cleaned during the interim closure activities described above, it is anticipated that the pipeline can be classified and handled as nonhazardous waste in accordance with Title 22, California Code of Regulations ' (22 CCR)66260.10. In order to demonstrate that these materials do not exhibit the characteristics of a hazardous waste, the interior of the piping will be rinsed with approximately 100 gallons of water. The rinse water will be stored in a Baker Tank where a single sample will be collected. The pH of the sample will be analyzed to evaluate corrosivity. In addition, the toxicity of the sample will be evaluated by conducting analysis for DBCP and EDB using EPA Method 8011, organochlorine pesticides using EPA Method 8080, and organophosphorus pesticides using EPA Method 8140. These results of these analysis will be compared to 22 CCR 66261.22 and 66261.24 ' to demonstrate that the metal does not exhibit the characteristics of a hazardous waste prior to disposal as scrap metal. 8